/* $Id$ */ /* * This file is part of OpenTTD. * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2. * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>. */ /** @file allegro_s.cpp Playing sound via Allegro. */ #ifdef WITH_ALLEGRO #include "../stdafx.h" #include "../driver.h" #include "../mixer.h" #include "../debug.h" #include "allegro_s.h" #include <allegro.h> static FSoundDriver_Allegro iFSoundDriver_Allegro; /** The stream we are writing too */ static AUDIOSTREAM *_stream = NULL; /** The number of samples in the buffer */ static const int BUFFER_SIZE = 4096; void SoundDriver_Allegro::MainLoop() { /* We haven't opened a stream yet */ if (_stream == NULL) return; void *data = get_audio_stream_buffer(_stream); /* We don't have to fill the stream yet */ if (data == NULL) return; /* Mix the samples */ MxMixSamples(data, BUFFER_SIZE); /* Allegro sound is always unsigned, so we need to correct that */ uint16 *snd = (uint16*)data; for (int i = 0; i < BUFFER_SIZE * 2; i++) snd[i] ^= 0x8000; /* Tell we've filled the stream */ free_audio_stream_buffer(_stream); } /** There are multiple modules that might be using Allegro and * Allegro can only be initiated once. */ extern int _allegro_instance_count; const char *SoundDriver_Allegro::Start(const char * const *parm) { if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) return "Failed to set up Allegro"; _allegro_instance_count++; /* Initialise the sound */ if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) return "Failed to set up Allegro sound"; /* Okay, there's no soundcard */ if (digi_card == DIGI_NONE) { DEBUG(driver, 0, "allegro: no sound card found"); return "No sound card found"; } _stream = play_audio_stream(BUFFER_SIZE, 16, true, 44100, 255, 128); MxInitialize(44100); return NULL; } void SoundDriver_Allegro::Stop() { if (_stream != NULL) { stop_audio_stream(_stream); _stream = NULL; } remove_sound(); if (--_allegro_instance_count == 0) allegro_exit(); } #endif /* WITH_ALLEGRO */